Missing properties in ARTClientOptions

[ikbalkaya]

Captured in following issue
ably/ably-flutter#14

There are some properties missing in ARTClientOptions. I checked ones that were not relevant anymore. The remaining properties

• useTokenAuth
• realtimeRequestTimeout
• fallbackRetryTimeout
• asyncHttpThreadpoolSize

For details of the properties please see linked issue.

┆Issue is synchronized with this Jira Story by Unito

[maratal]

Research references:

• useTokenAuth - that's in ARTAuthOptions
• realtimeRequestTimeout - that's in ARTDefault, described in docs as a part of defaults, not options
• fallbackRetryTimeout - also in ARTDefault, but should go in client options according to the docs
• asyncHttpThreadpoolSize - this is something that was removed from docs presumably (https://docs.ably.io/client-lib-development-guide/features contains nothing like that at least)

So, for all mentioned properties only fallbackRetryTimeout requires implementation in the ARTClientOptions